Reversible stove.



W. THOMAS.

REVERSIBLE STOVE. APPLICATION FILED JUNE 4, I915. RENEWED DEC. 23,1918.

1,293,578, Patented Feb. 4, 1919.

2 SHEETS-SHEET I 1h: uomus P115125 :0, Puamurmz, vusmmmw. v. c.

W. THOMAS.

REVERSIBLE STOVE. APPLICATION FILED JUNE 4, I915. RENEWED DEC. 23, I918.

1,293,578, Patented Feb. 4, 1919.

2 SHEETS-SHEET 2- @ymi Mzm ado mm WALTER THOMAS, F NANAIMO, BRITISH COLUMBIA, CANADA..

REVERSIBLE STOVE.

Application filed June 4, 1915, Serial No. 32,165.

To all whom it may concern:

Be it known that I, WALTER THOMAS, a

Y subject of the King of Great Britain, residing at Nanaimo, British Columbia, Canada, have invented certain new and useful Improvements in Reversible Stoves, of which the following is a specification.

This invention relates to a stove or furnace which may be revolved or reversed for bringing a body of incandescent fuel on top of a body of fresh or green fuel and consuming all gases and vapors.

The prlncipal object-of my invention 1s to provide for passing the freshly evolved vapors and carbonic acid from green fuel,- wood, coal, peat or lignite,through a body or layer of incandescent fuel for converting them into fixed gas, and supplying thereto a secondary air supply for causing complete combustion before escaping to the chimney or stack, whereby the calorific value of the fuel is more fully utilized and smoke is prevented.

Another object is to provide certain de tails of construction in a revoluble stove or furnace for securing convenience and efficiency in operation.

The matter constituting my invention will be defined in the claims.

y I will now describe the details of construction of my reversible stove or furnace by reference to the accompanying drawings in which Figure 1 represents a front end elevation, partly in transverse section.

Fig. 2 represents a longitudinal vertical section.

Fig. 3 represents a horizontal sectional detail on line 3-3, Fig. 1, showing amodification of an air inlet valve.

Fig. 4 represents an elevation of a stove connecting with a hot air furnace.

Fig. 5 represents an elevation of a stove connecting with a steam boiler furnace and showing a modification of air inlets.

Fig. 6 represents a longitudinalvertical section of a modified construction of revoluble stove.

Fig. 7 represents a longitudinal vertical section showing another modified construction of air supply inlets and pipes in a brick lined reversible furnace.

Referring now to Figs. 1 and 2: The body or shell A of the stove is constructed of sheet metal and is provided with hollow journals, as B, serving as a smoke escape Specification of Letters Patent.

Patented Feb. a, 191.9.

Renewed December 23, 1918. Serial No. 268,057.

pipe to a chimney, and G, serving as an air supply pipe. Air-may be supplied to pipe C by a high power blower of any well known kind, such as a Root blower, not here shown, or simply by natural draft. The stove may be made with fiat sides and curved at top and bottom, as shown in Fig. 1, or simply rectangular in cross section. Grates a, a are placed at top and bottom so as to form two opposite ash pits B B The journals are supported in bearings d, 6', having antifriction rollers t, at the tops of the supporting end frames D. The air supply pipe C connects by two interior branch pipes 0, c with the opposite ash pits, being curved as shown to pass to one side of the doors. In the front end are provided openings for feeding fuel and removing ashes for both grates and closed by upper and lower doors 9, h and g, h. Openings d in one of the end frames give access to the doors.

Air may be supplied in various ways to the ash pits and I will first describe the means shown best in Fig. 2. The shell is provided with inlet ports 6, Z) into each ash pit, and valve boxes F, F having openings and seats f, f for the spring valves E, E each provided with a head 6 and a coiled spring e. A beveled or double inclined slide-way H is fixed to the floor or may connect with the end frames by bars 72.. When the shell is turned to bring the valve E down to the bottom the head 0 will slide 011 the inclined face of the slide-way H .and automatically open the valve port f,

so that air will be admitted to ash pit B In case a full supply of air is not desired the shell will not be fully turned one half over and the valve head will rest upon the inclined face of the slide-way and the valve will only be partly opened, thus admitting only a limited supply of air. The air supply may be thus regulated to suit the requirements.

In case a forced air blast, under pressure, is required it is admitted through pipe 0 from a pressure blower and directed to the ash pits by the branch pipes c, c, the butterfly valve z" or 2" being opened to the ash pit which at the time is down. Secondary air supply pipes Z, Z connect each ash pit with the middle part or combustion chamber of the stove for admitting air from either ash pit to said chamber above the fuel for burning the gases escaping from the incandescent fuel. he secondary air suppy pipes 0 may be placed in the front end wall as shown in Figs. 1 and 3.

The air inlet and spring valve may be placed in the end wall as indicated in Fig. 3, in which a port I) is connected by an interior pipe C leading to the ash pits B and B Fig. l. The head 6 of the spring valve E slides upon a beveled slideway H formed on an arm d" of the end frame D. Air may be admitted centrally by a hollow journal C for secondary combustion. In this modification there will be two pipes C one to each ash pit.

In Fig. 4 the reversible stove is shown connected with a hot air furnace X and in Fig. 5 it is shown connecting with a steam boiler furnace Y and having the arrangement of air supply pipes shown more clearly in Fig. 7.

In Fig. 6 the central air pipe C may admit secondary air to the combustion chamber. The air pipes C having valves E lead to the ash pits and may be constructed and operated substantially as above described with reference to Fig. 3. Secondary air-pipes Z, Z connect the ash pits B B with the central pipe C for secondary air supply.

In the modified construction shown in Fig. 7 the furnace A is shown lined with fire brick a or other refractory non conducting lining and is intended for a large heater or furnace, the shell being constructed of heavy boiler plate. A short central air inlet pipe 0 having inlet ports, a", connects with the end of the stove, and by interior pipes C, 0 having butter fly valves 02, or other valves, with the opposite ash-pits B B Au interior pipe Z, having a valve 7t, opens into the combustion chamber for sup plying secondary air to burn the gases above the body of fuel. The pipes or passages (I will be oppositely deflected as shown in Fig. 1, or both to one side, to avoid the fuel and ash-pit doors. This construction of heater or furnace will be adaptedfor large works, such as pottery and brick kilns, steam boilers, cement and lime burning retorts or kilns.

A fire may be kindled on the lower grate a with Wood or charcoal and when a sufficient bed of ignited fuel has been formed fresh green fuelcoal or woodis fed in through the upper door n, so as to cover the bed of incandescent fuel, and then the heater is turned a half revolution, thereby disposing the green fuel on the grate a (now the lower grate) with the layer of incandescent fuel on top. The volatile gases and vapors evolved from the green fuel now pass through the incandescent fuel and become converted into fixed gas. The carbonic acid passing from the green fuel will be converted into carbonmonoxidin the incandescent fuel and all the gases will be completely consumed or burned above the body of fuel by the secondary air supply passed by one of the pipes Z or Z from the ash pit into the combustion chamber, or by other secondary air supply pipes above described. The spent waste products of complete combustion will pass off by pipe B to a chimney or to a hot air furnace X, Fig. 4:, or a tubular boilerY, Fig. 5, or to other place of use. When rapid combustion and a high heat is desired air under pressure is admitted through'pipes C, c, c for primary and secondary combustion.

Very economical and satisfactory results are obtained in the combustion of wood or coal with this construction of heater. The

fire may be agitated when necessary, for

shaking down ashes, without opening the doors, by simply rocking the heater.

Having described my invention, what I claim, and desire to secure by Letters Patcut, is: v

1. A reversible and revoluble stove or furnace, comprising a shell having opposite ashpits and grates, an air inlet to each ash pit havlng a spring valve and means for automatically opening a valve when the shell is reversed for admitting air to the lower ashlpit, a secondary air supply inlet to the comustion chamber between the grates and a hollow journal for escape of products of combustion.

:2. A reversible stove comprising a single casing '01 shell havingopposite fixed grates and ash pits, providing secondary combustion chamber between the grates, valve controlled means for admitting air to both ash pits, means for automatically opening either of said valves when in operative position, separate means for supplying air to saidcombustion chamber and separate means for passing off products from said combustion chamber between the grates, whereby fresh fuel may be placed upon incandescent fuel and the stove reversed, thereby placing the fresh fuel at the bottom for causing vapors therefrom to pass through the incandescent fuel for converting the vapors into fixed gas and for burning such gas.

In testimony whereof I affix my signature in presence of two Witnesses.

. WALTER THOMAS.

lVitnesses A. E. PLANTA, A. N. LEE, Jr.

(lo lies of this patent may be obtained for five cents each, by addressing the comifilssidner of Patents,

' Washington, D. G. i 

